If time and Luxuries were of no concern, I'd opt to home-build my ECO car... MOST simple/practical Sand rails and dune buggy kits top out at $5k... Make your own template based frame, make a sleek shell and drop your own powerplant in.
^^^
I could only dream right now.
Of course my preferred car would be a 1976 mini 1.3s! up to 40mpg stock
in style